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Intermittent 771\755 error message

I have been a Directv user since 1996. All dishes and equipment have been self installed. About 5 years ago I installed a new Slimline Dish and a SWM-8 and all has been operating perfectly since then. I have 2, HD DVR's and 2, HD receivers connected to the SWM-8.

Recently, one of the receivers has showed intermittent 771\755 error messages, and the video breaks up. This happens when the receiver is first turned on, but after an hour or so the receiver seems to work ok. I also get loss of guide info and other messages. A reboot sometimes help. Signal strength readings are excellent, but slow to display on some satellites. Now, one of the DVR's is very slow switching channels and sometimes exhibits the same symptoms, but not as often. The other 2 ird's work fine.

The SWM is under my back deck and is shielded from rain, ice and snow. The PI29R1-03 29V Power Inserter is located in a basement room about 10 feet from the SWM-8.

I feel pretty sure that cables and\or connectors are NOT the issue. But, info found here and on other sites leads me to believe that a defective Power Inserter may be the issue. The SWM-8 is located about 80-90 feet from the Slimline Dish.

Could a defective Power Inserter affect only 2 out of 4 receivers? Or is there something else in play?